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Lab 1.5 Finding Concentration of a Solution Jason Yu (Block C) Research Question Which of the following methods give a value of NaOH concentration closest to the 'real' value1? 1. Weighing the solute, 2. Titrating it 1. No literature value available, we need to find by most accurate method Data Collection: Method A (Weighing NaOH) Quantitative Data: Method A: Weighing NaOH Mass of NaOH pellets (zeroed beaker) = 0.412 ± 0.001 g Volume of standard solution = 100.0 ± 0.5 cm3 Qualitative Data: On electronic balance: Two white and round NaOH pellets which were dry soon become wet and moist on surface, as seen by it gaining luster at time of measurement, which was a minute or two after taking out of the storing bottle.. In preparing NaOH solution: By crushing with glass rod, white NaOH pellets dissolve in water to form clear solution. Data Collection: Method B (Titration) Quantitative Data: Method B: Titration of NaOH Titration No Rough 1 Rough 2 1 2 3 4 (Vanessa Yu's) Indicator (titration by) phn1 phn phn phn phn phn Final burette reading (cm) 9.9 11.80 30.4 30.5 39.9 42.4 Initial...

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